stiles



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' W. G. STILES.

GRINDING AND PULVERIZING APPARATUS. Nag-247,585.

Patented Sept. 27, 1881.

Wihe ees ITI van 1hr (No Model.)

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W. G. STILES.

GRINDING AND PULVERIZING APPARATUS.

No.24'7,585 A Patente dSep1lZ7J881.

IJNITED STATES PATENT OFFICE.

WVILLIAM O. STILES, OF NEVADA CITY, CALIFORNIA, ASSIGNOR TO GEORGE Gr. ALLAN, OF SAME PLACE.

GRINDING AND PULVERIZING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 247,585, dated September 2'7, 1881.

Application filed October 28, 1880. (No model.)

To all whom it may concern Be it known that I, WILLIAM C. S'rILEs,ot' the city and county of Nevada, State of California, have invented an Improved Pulverizer;

5 and I hereby declare the following to be a full,

clear, and exact description thereof.

My invention relates to anovel apparatus for pulverizing substances which are to be reduced to a powder or flour for any purpose, such as valuable ores, grain, 85c.

It consists ofa large cylinder havingits outer surface or periphery covered with a screen of the fineness desired. Within this screen, and at a short distance from it, is another coarser screen. Midway between the sides of the drum or cylinder is a heavy flange or ring, the inner diameter of which is somewhat less than that of the inner screen, and it has a deep V-shaped groove in it. A smaller wheel is supported upon a shaft, so that its convexperiphery, also V-shaped, will run in the groove above described.

The ore is fed into the inside of the large drum, falling upon the coarseinnerscreen, from which it is carried to the top by buckets, and is delivered into a trough, which discharges it behind the small wheel, so that it is ground between it and the concave flange before described until fine enough to pass through the 0 outer screen. That which is not sufficiently fine is returned upon the inner screen by inclined chutes leading from the outer to theinner one, and will be again ground until it is line enough to pass the outer screen.

Figure l is a view of my apparatus. Fig. 2 is a vertical section of the same. Fig. 3 is a sectional view through the case.

A is adrum or cylinder, of considerable size, having rings or flanges, which serve to support the screens forming the periphery. This cylinder is mounted upon a driving-shaft, B, and a driving gear-wheel, O, at the end of this shaft is the medium through which it is rotated. The exterior surface of the cylinder is formed- 4 5 of or covered with screen material D, of a fineness equal to that desired for the material to be crushed or pulverized.

A second cylindrical screen, E, having a coarser and stronger mesh, is secured within the outer one, forming an interior cylinder of considerably less diameter than the outer one.

This inner screen-cylinder is divided in its center by aring, F, formed, either solid or in sections, of iron. The inner face of this ring may be made of anydesired or suitable shape; but, as here shown, it is made of a concave Vshape,

to receive the convex edge of the pulverizingwheel G. This wheel or rolleris of very much smaller diameter than the drum A, and is mounted upon a shaft or axle, H, which turns in journal-boxes I, upon the frame-work of the machine. These boxes and the axle H are placed so that the convex rim of the wheel G will be caused to run in the groove in the ring F at a point about on a level with the axis of the drum A or a little below it.

A series of elevating-cups J are secured within the inner screen-drum, E, close to the ring F, and when the ore is fed'into this drum the cups carry it up when the drum is rotated. When they reach the top they discharge the ore into a trough or chute, K, which delivers it between the wheel Gr and ring F, and it is pulverized by passing between the concave and convex surfaces before described.

In order to produce the best results, I prefer to drive the wheel G at ahigher rate of speed than that of the drum A and the ring F, so that it produces a grinding action, and also carries the ore through with greater rapidity. This pulverized ore falls into the inner screen, E, and, passing through its coarse meshes to the outer screen, D, all that is time enough will pass through this and be discharged. The remainder will be returned to the inner screen by means ofinclined plates L, which extend from the outer to the inner screen, as shown, and an opening in the latter allows the ore which comes upon the inclines to be returned to the inner screen by the continued rotation 0f the drum. This returned ore is again taken up by the cups, together with that newly fed into the machine, and is delivered into the chute, to be again ground between the pulverizingsurfaces until it is fine enough to pass through the outer or fine screen.

In order to regulate the pressure of the wheel Gr against the ring, and thereby determine the pulverizing-force, I mount the journal-boxes I of the shaft H upon guides M so that they may be moved upon the guides. A lever, N, or an equivalent cam, eccentric, or other device is connected with the box I which is nearest to the wheel G, and a weight is suspended by a rope or chain, which extends from the lever, over a pulley, 0, upon a suitable standard or frame, so as to draw the box and shaft forcibly to one side, and thus cause the Wheel Gto press with greaterforce against the ring. Ascrew, P, is fitted, so that its point presses against the lever, and by turning this screw out or in the position of the wheel G is determined, it being thus held as near to the concave ring as is necessary to produce the desired fineness of the material.

The shaft H is driven by a pulley or gear wheel upon its end, and may have any speed that may be found best adapted to the class of material which is being worked. I prefer to run the wheel G faster than the drum A, so that theeffect of any irregularities between the wheel G and the ring F will be overcome. The outer journal-box I is also adjusted by means of a screw to hold it in its proper relation to the other box and the wheel.

I am aware that rotatingcylinders have been constructed with an inner grinder, which rolls upon the bottom of the outer cylinder, and I do not claim, broadly, such construction.

In my apparatus the crushing -wheel G is supported so as to rotate against a die within the drum at a point upon one side and above the bottom, so that there will not be a large mass of ore beneath the rollerat anyone time. By placing it upon the sideIam able to feed the ore to it from the chuteor spout above, so that it passes through the space between the roller and the dies in a constant stream of small size, and by this method every particle of the ore will be passed in a thin stratum between the crushing and grinding surfaces. This gives a much more rapid and complete pulverizing of the ore than would be the case if the roller were at the bottom of the drum.

Having thus described my intention, what I claim as new, and desire to secure by Letters Patent, is-

The pulverizin g device consisting of the annulus F, with its concave V-shapedinnerface, and the wheel G, with a corresponding convex face rotating in the groove at a point above the bottom of the ring, in combination with the drum A, having the outer and inner screeningsurfaces, with their connecting-inclines L, and the elevating cups and chutes, substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

WM. 0. STILES. 

